Laser projection light source and laser projection equipment

Abstract

The present invention discloses a laser projection light source and a laser projection device, wherein the laser projection light source comprises: a shell, the shell comprises a first side wall and a second side wall opposite to each other, and a third side wall perpendicular to the first side wall and the second side wall, the first side wall and the second side wall are respectively provided with an accommodating opening, respectively used to accommodate a laser, and the third side wall is provided with a light outlet; a light combining lens group is provided corresponding to each laser, the laser comprises multiple light outlet areas, the light combining lens group comprises multiple reflectors corresponding to the multiple light outlet areas, respectively used to emit light beams emitted by the multiple light outlet areas toward the light outlet; the multiple light outlet areas are used to emit light of multiple colors and different polarization directions, and a first wave plate is provided between at least one of the multiple light outlet areas and a corresponding reflector.

Description

[0001] This application is based on the Chinese invention application No. 201911025064.6 (October 25, 2019), invention title: A divisional application for a laser projection light source and a laser projection device Technical Field

[0002] The present invention relates to the technical field of laser projection equipment, and in particular to a laser projection light source and a laser projection equipment. Background Art

[0003] Laser projection light sources are a crucial component of laser projection equipment, such as laser TVs and laser projectors, providing the illumination beam. To increase the brightness of the beam emitted by a laser projection light source, multiple lasers can be incorporated into the source. By combining the beams from these multiple lasers into a single beam, the brightness of the laser projection light source can be multiplied. However, since lasers are typically monochromatic lasers (e.g., blue, red, or green lasers), and the beam emitted by a laser projection light source is a white light beam, multiple fluorescent wheels are required within the laser projection light source to correspond one-to-one with the multiple lasers. Each fluorescent wheel generates two other colors of laser light under the excitation of the monochromatic laser light emitted by the laser corresponding to the fluorescent wheel. The two other colors of laser light mix with the monochromatic laser light emitted by the laser to form white light. To achieve the purpose of light mixing, multiple sets of lenses are required within the laser projection light source to correspond one-to-one with the multiple fluorescent wheels. Each set of lenses is used to change the transmission path of the two other colors of laser light so that the two other colors of laser light mix with the monochromatic laser light emitted by the laser. After the white light is mixed to form white light, the multiple beams of white light are combined into one beam to increase the brightness of the beam emitted by the laser projection light source. This results in the laser projection light source including a large number of components, thereby increasing the structural complexity and volume of the laser projection light source. Summary of the Invention

[0004] The present invention provides a laser projection light source and a laser projection device, which are used to solve the problem of how to reduce the volume and structural complexity of the laser projection light source while improving the brightness of the light beam emitted by the laser projection light source.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, an embodiment of the present invention provides a laser projection light source, comprising: a shell, two lasers and an optical path assembly, wherein the shell comprises a first side wall and a second side wall opposite to each other, and a third side wall perpendicular to the first side wall and the second side wall, the first side wall and the second side wall are respectively provided with a receiving opening, and the third side wall is provided with a light outlet; the two lasers are respectively installed at the receiving openings on the first side wall and the second side wall, each laser emits light toward the shell, and the light outlet surface of each laser includes multiple light outlet areas, which are used to emit light of multiple colors; the optical path assembly is arranged in the shell, and the optical path assembly is used to combine the multiple colors of light emitted by the two lasers, and make the two combined light beams emitted toward the light outlet.

[0007] In some embodiments, the light-emitting surface of each laser includes a first light-emitting area, a second light-emitting area, and a third light-emitting area; the first light-emitting area is used to emit a first color light beam; the second light-emitting area is used to emit a second color light beam; the third light-emitting area is used to emit a third color light beam; the first color light beam, the second color light beam, and the third color light beam are combined to form a white light beam.

[0008] In some embodiments, the optical path assembly includes two light-combining lens groups and a reflector; the two light-combining lens groups are respectively used to combine the multiple colors of light emitted by the two lasers, and both light-combining lens groups emit light beams toward the reflector; the reflector is used to change the transmission path of the output light beams of the two light-combining lens groups so that the output light beams of the two light-combining lens groups are emitted from the light outlet.

[0009] In some embodiments, the first light emitting area, the second light emitting area, and the third light emitting area of ​​each laser are arranged in sequence along the direction close to the reflector; each light combining lens group includes a first reflector, a second reflector, and a third reflector, the first reflector is located on the light emitting side of the first light emitting area of ​​the laser corresponding to the light combining lens group, and the first reflector reflects the first color light beam emitted from the first light emitting area, the second reflector is located on the second light emitting area of ​​the laser corresponding to the light combining lens group and the light emitting side of the first reflector, the second reflector reflects the second color light beam emitted from the second light emitting area and transmits the first color light beam reflected by the first reflector, the third reflector is located on the third light emitting area, the first reflector, and the light emitting side of the second reflector of the laser corresponding to the light combining lens group, the third reflector reflects the third color light beam emitted from the third light emitting area and transmits the first color light beam reflected by the first reflector and the second color light beam reflected by the second reflector; the optical axis of the first color light beam reflected by the first reflector, the optical axis of the second color light beam reflected by the second reflector, and the optical axis of the third color light beam reflected by the third reflector are collinear.

[0010] In some embodiments, the distance between the first reflective lens and the first light exit area on the central axis of the first light exit area is a first distance; the distance between the second reflective lens and the second light exit area on the central axis of the second light exit area is a second distance; the distance between the third reflective lens and the third light exit area on the central axis of the third light exit area is a third distance; the first distance, the second distance and the third distance are all 1 to 6 mm.

[0011] In some embodiments, the first color light beam emitted from the first light exit area is one of a blue light beam and a green light beam, the second color light beam emitted from the second light exit area is the other of the blue light beam and the green light beam, and the third color light beam emitted from the third light exit area is a red light beam.

[0012] In some embodiments, the polarization direction of the first color light beam emitted from the first light exit area is the same as the polarization direction of the second color light beam emitted from the second light exit area, and the polarization direction of the second color light beam emitted from the second light exit area is perpendicular to the polarization direction of the third color light beam emitted from the third light exit area; a first wave plate is provided between the third light exit area and the third reflective lens, and the first wave plate is used to rotate the polarization direction of the third color light beam emitted from the third light exit area by 90°±10°.

[0013] In other embodiments, the polarization direction of the first color light beam emitted from the first light exit area is the same as the polarization direction of the second color light beam emitted from the second light exit area, and the polarization direction of the second color light beam emitted from the second light exit area is perpendicular to the polarization direction of the third color light beam emitted from the third light exit area; a second wave plate is arranged between the first light exit area and the first reflective lens, and a third wave plate is arranged between the second light exit area and the second reflective lens, the second wave plate is used to rotate the polarization direction of the first color light beam emitted from the first light exit area by 90°±10°, and the third wave plate is used to rotate the polarization direction of the second color light beam emitted from the second light exit area by 90°±10°.

[0014] In some embodiments, the second wave plate and the third wave plate are integrally formed.

[0015] In some embodiments, a spherical lens is installed in the light outlet, and the spherical lens can converge the light beam entering the light outlet.

[0016] In some embodiments, a light homogenizer is provided on the light incident side of the light outlet.

[0017] The laser projection light source provided by the present invention combines the multiple colors of light emitted by two lasers through an optical path component, and then emits the two combined light beams toward a light outlet to achieve superposition of multiple light beams, thereby enabling the laser projection light source to have higher brightness. Furthermore, because the light-emitting surfaces of the lasers within the laser projection light source each include multiple light-emitting regions for emitting light of multiple colors, the laser projection light source provided by the present invention does not require a large number of lenses, thereby reducing the volume and structural complexity of the laser projection light source.

[0018] In the second aspect, an embodiment of the present invention provides a laser projection device, comprising a laser projection light source, an optical machine and a projection lens connected in sequence, wherein the laser projection light source is the laser projection light source described in any of the above technical solutions, the optical machine is used to modulate the illumination light beam emitted by the laser projection light source to generate an image light beam, and project the image light beam to the projection lens, and the projection lens is used to image the image light beam.

[0019] The present invention provides a laser projection device. Since the laser projection device includes the laser projection light source described in any of the above technical solutions, the laser projection device provided by the present invention and the laser projection light source described in the above technical solutions can solve the same technical problems and achieve the same expected effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is one of the three-dimensional diagrams of a laser projection light source provided by an embodiment of the present invention;

[0022] Figure 2 A second stereoscopic diagram of a laser projection light source provided by an embodiment of the present invention;

[0023] Figure 3 One of the optical path diagrams of the first optical path component in a laser projection light source provided by an embodiment of the present invention;

[0024] Figure 4 A second optical path diagram of the first optical path component in a laser projection light source provided by an embodiment of the present invention;

[0025] Figure 5 A schematic structural diagram of a laser in a laser projection light source provided by an embodiment of the present invention;

[0026] Figure 6 A schematic structural diagram of a laser, a light combining lens group, and a first wave plate in a laser projection light source provided by an embodiment of the present invention;

[0027] Figure 7 A schematic structural diagram of a laser, a light combining lens group, a second wave plate, and a third wave plate in a laser projection light source provided by an embodiment of the present invention;

[0028] Figure 8 A light path diagram of a second light path component in a laser projection light source provided by an embodiment of the present invention;

[0029] Figure 9 This is a schematic structural diagram of a laser projection device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical connections; direct connections or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0032] Laser projection light source is an important component of laser projection equipment, and is used to provide illumination beam.

[0033] In a first aspect, an embodiment of the present invention provides a laser projection light source 1, which includes: a housing 11, two lasers 12 and an optical path component 13, wherein Figure 1 and Figure 2 As shown, the housing 11 includes a first side wall 200 and a second side wall 300 that are opposite to each other, and a third side wall 400 that is perpendicular to the first side wall 200 and the second side wall 300. The first side wall 200 and the second side wall 300 are respectively provided with a receiving opening 111, and the third side wall 400 is provided with a light outlet 112. Two lasers 12 are respectively installed at the receiving openings 111 on the first side wall 200 and the second side wall 300, and each laser 12 emits light toward the inside of the housing 11, as shown in FIG. Figure 5As shown, the light-emitting surface of each laser 12 includes multiple light-emitting areas, and the multiple light-emitting areas are used to emit light of multiple colors; Figure 3 or Figure 8 As shown, the optical path component 13 is disposed in the housing 11 , and is used to combine the lights of multiple colors emitted by the two lasers 12 , and emit the combined two light beams toward the light outlet 112 .

[0034] The laser projection light source provided by the present invention combines the multiple colors of light emitted by two lasers 12 into a beam through the optical path component 13, and emits the two combined beams toward the light outlet 112 to achieve the superposition of multiple beams of light, thereby enabling the laser projection light source to have a higher brightness. Figure 5 As shown, since the light-emitting surfaces of the lasers in the laser projection light source 1 include multiple light-emitting areas, and the multiple light-emitting areas are used to emit light of multiple colors, there is no need to set a large number of lenses in the laser projection light source 1 provided by the present invention, thereby reducing the volume and structural complexity of the laser projection light source 1.

[0035] The light-emitting surface of the laser 12 may include two light-emitting areas, three light-emitting areas, or four light-emitting areas, etc., which are not specifically limited herein. Optionally, the number of light-emitting areas included in the light-emitting surface of the laser 12 is equal to the number of colors emitted by the light-emitting surface of the laser 12, and each light-emitting area is used to emit light of one color.

[0036] In some embodiments, as Figure 5 As shown, the light-emitting surface of each laser 12 includes a first light-emitting area 121, a second light-emitting area 122, and a third light-emitting area 123. The first light-emitting area 121 is used to emit a first color light beam; the second light-emitting area 122 is used to emit a second color light beam; and the third light-emitting area 123 is used to emit a third color light beam. The first, second, and third color light beams are combined to form a white light beam. This simple structure eliminates the need for a fluorescent wheel within the laser projection light source 1, further reducing the size of the laser projection light source 1.

[0037] In the above embodiment, the colors of the first color light beam, the second color light beam and the third color light beam are not specifically limited, as long as the first color light beam, the second color light beam and the third color light beam can be mixed to form white light. Figure 5 As shown, the first color light beam emitted by the first light emitting area 121 is a blue light beam, the second color light beam emitted by the second light emitting area 122 is a green light beam, and the third color light beam emitted by the third light emitting area 123 is a red light beam. For another example, the first color light beam emitted by the first light emitting area 121 is a cyan light beam, the second color light beam emitted by the second light emitting area 122 is a yellow light beam, and the third color light beam emitted by the third light emitting area 123 is a magenta light beam.

[0038] The first light emitting area 121, the second light emitting area 122 and the third light emitting area 123 may correspond to one lamp bead in the laser 12, or may correspond to one row of lamp bead in the laser 12, or may correspond to multiple rows of lamp bead in the laser 12, which is not specifically limited here. In some embodiments, Figure 5 As shown, the third light emitting area 123 corresponds to two rows of lamp beads in the laser 12, and the first light emitting area 121 and the second light emitting area 122 each correspond to a row of lamp beads in the laser 12. Each row of lamp beads includes 6 lamp beads.

[0039] In some embodiments, a spherical lens 14 is installed in the light outlet, and the spherical lens 14 can converge the light beam entering the light outlet. In this way, the optical elements (such as the optical components) in the subsequent optical machine of the laser projection light source 1 Figure 1 and Figure 2 The size of the light pipe 100 in the laser projection apparatus can be designed to be smaller, which is beneficial to reducing the size of the laser projection apparatus.

[0040] The optical path component 13 has various structural forms. For example, the structure of the optical path component 13 can have the following two embodiments:

[0041] Example 1, as Figure 3 and Figure 4 As shown, the optical path assembly 13 includes two light-combining lens groups 131 and a reflector 132. The two light-combining lens groups 131 are respectively used to combine the multiple colors of light emitted by the two lasers 12, and both light-combining lens groups 131 emit light beams toward the reflector 132. The reflector 132 is used to change the transmission path of the light beams emitted by the two light-combining lens groups 131 so that the light beams emitted by the two light-combining lens groups 131 are emitted from the light outlet 112. In this way, the structure of the optical path assembly 13 is simple and the cost is low. The laser projection light source is small in size, has low structural complexity, and is easy to implement.

[0042] In some embodiments, as Figure 5 As shown, the first light emitting area 121, the second light emitting area 122, and the third light emitting area 123 of each laser 12 are all along the direction close to the reflector 132 (that is, Figure 3 and Figure 4 The direction X) is arranged in sequence; Figure 3 and Figure 4As shown, each light-combining lens group 131 includes a first reflecting lens 1311, a second reflecting lens 1312 and a third reflecting lens 1313. The first reflecting lens 1311 is located at the light-emitting side of the first light-emitting area 121 of the laser 12 corresponding to the light-combining lens group 131. The first reflecting lens 1311 reflects the first color light beam emitted from the first light-emitting area 121. The second reflecting lens 1312 is located at the second light-emitting area 122 of the laser 12 corresponding to the light-combining lens group 131 and the light-emitting side of the first reflecting lens 1311. The second reflecting lens 1312 reflects the second color light beam emitted from the second light-emitting area 122 and transmits the second color light beam reflected by the first reflecting lens 1311. The third reflector 1313 is located on the light-emitting side of the third light-emitting area 123 of the laser 12, the first reflector 1311, and the second reflector 1312, corresponding to the light-combining lens group 131. The third reflector 1313 reflects the third color light beam emitted from the third light-emitting area 123 and transmits the first color light beam reflected by the first reflector 1311 and the second color light beam reflected by the second reflector 1312. The optical axis of the first color light beam reflected by the first reflector 1311, the optical axis of the second color light beam reflected by the second reflector 1312, and the optical axis of the third color light beam reflected by the third reflector 1313 are collinear. In this way, the light-combining lens group 131 can combine the multiple colors of light emitted by the laser 12. This structure is simple, occupies less space, and is conducive to reducing the volume of the laser projection light source 1.

[0043] In the above embodiment, it should be known that it is difficult to ensure that the optical axis of the first color light beam after being reflected by the first reflecting lens 1311, the optical axis of the second color light beam after being reflected by the second reflecting lens 1312, and the optical axis of the third color light beam after being reflected by the third reflecting lens 1313 are absolutely collinear during the actual processing and installation of the laser projection light source 1. Therefore, the "collinearity" of the optical axis of the first color light beam after being reflected by the first reflecting lens 1311, the optical axis of the second color light beam after being reflected by the second reflecting lens 1312, and the optical axis of the third color light beam after being reflected by the third reflecting lens 1313 described in the embodiment of the present application cannot be understood as absolute collinearity, but should be understood as "collinear or approximately collinear". For example, the optical axis of the first color light beam reflected by the first reflecting lens 1311, the optical axis of the second color light beam reflected by the second reflecting lens 1312, and the optical axis of the third color light beam reflected by the third reflecting lens 1313 described in the embodiment of the present application are collinear, which means that, among the optical axis of the first color light beam reflected by the first reflecting lens 1311, the optical axis of the second color light beam reflected by the second reflecting lens 1312, and the optical axis of the third color light beam reflected by the third reflecting lens 1313, the distance between any two optical axes is less than a first specific value, and the angle between any two optical axes is less than a second specific value. The first specific value can be 1 mm, 2 mm, or 3 mm, etc., which is not specifically limited here. The second specific value can be 1°, 2°, or 3°, etc., which is not specifically limited here.

[0044] The first reflective lens 1311 can be a total reflection mirror, a dichroic lens, or other structures, which are not specifically limited here. Figure 3 and Figure 4 As shown, the first reflective lens 1311 is a total reflection mirror.

[0045] The second reflective lens 1312 and the third reflective lens 1313 can be dichroic lenses or other structures, which are not specifically limited here. Figure 3 and Figure 4 As shown, the second reflective lens 1312 and the third reflective lens 1313 are dichroic films.

[0046] In some embodiments, as Figure 6As shown, the distance between the first reflective lens 1311 and the first light exit area 121 on the central axis l1 of the first light exit area 121 is a first distance h1; the distance between the second reflective lens 1312 and the second light exit area 122 on the central axis l2 of the second light exit area 122 is a second distance h2; the distance between the third reflective lens 1313 and the third light exit area 123 on the central axis l3 of the third light exit area 123 is a third distance h3; the first distance h1, the second distance h2, and the third distance h3 are all 1 to 6 mm. In this way, the distance between the light combining lens group 131 and the laser 12 is moderate, which can reduce the size of the laser projection light source 1 in the direction perpendicular to the light exit surface of the laser 12, while avoiding collision damage between the light combining lens group 131 and the laser 12 during installation due to the close distance between the light combining lens group 131 and the laser 12.

[0047] In the above embodiment, it should be noted that Figure 6 As shown, the central axis l1 of the first light emitting area 121 is an axis perpendicular to the light emitting surface of the laser 12 and passing through the center of the first light emitting area 121; the central axis l2 of the second light emitting area 122 is an axis perpendicular to the light emitting surface of the laser 12 and passing through the center of the second light emitting area 122; the central axis l3 of the third light emitting area 123 is an axis perpendicular to the light emitting surface of the laser 12 and passing through the center of the third light emitting area 123.

[0048] The light emitted from the light emitting surface of the laser 12 is emitted by the light emitting device (i.e., the lamp bead) inside the laser 12. Compared with the light emitting devices emitting lasers of other colors, the light emitting device emitting red light has a larger divergence angle of the light beam. On this basis, in order to avoid a larger light spot when the light beam emitted by the laser 12 is reflected by the light combining lens group 131 and the reflector 132 and transmitted to the light outlet 112, in some embodiments, such as Figure 5 As shown, the first color light beam emitted by the first light exit area 121 is one of a blue light beam and a green light beam, the second color light beam emitted by the second light exit area 122 is the other of the blue light beam and the green light beam, and the third color light beam emitted by the third light exit area 123 is a red light beam. In this way, compared with the first color light beam emitted by the first light exit area 121 and the second color light beam emitted by the second light exit area 122, the third color light beam emitted by the third light exit area 123 (that is, the red light beam) has a shorter transmission path between the light exit surface of the laser 12 and the light exit port 112, and the light spot formed at the light exit port 112 is smaller, which can prevent the light spot of the light beam emitted by the laser 12 from being too large when it is reflected by the light combining lens group 131 and the reflector 132 and transmitted to the light exit port 112, and is conducive to reducing the diameter of the spherical lens installed in the light exit port 112.

[0049] In some embodiments, as Figure 5As shown, the polarization direction of the first color light beam emitted from the first light exit area 121 is the same as the polarization direction of the second color light beam emitted from the second light exit area 122, and the polarization direction of the second color light beam emitted from the second light exit area 122 is perpendicular to the polarization direction of the third color light beam emitted from the third light exit area 123.

[0050] In the above embodiment, in order to increase the light uniformity of the laser projection light source 1, the following two optional implementation methods can be used:

[0051] The first optional implementation method is Figure 6 As shown, a first wave plate 134 is provided between the third light exit area 123 and the third reflector lens 1313. The first wave plate 134 is used to rotate the polarization direction of the third color light beam emitted from the third light exit area 123 by 90°±10°. In this way, the polarization direction of the light beam emitted from the third light exit area 123 is changed by the first wave plate 134, so that the polarization direction of the light beam emitted from the third light exit area 123 is consistent with the polarization direction of the light beam emitted from the first light exit area 121 or the second light exit area 122, thereby improving the light output uniformity of the laser projection light source 1.

[0052] The second optional implementation method is Figure 7 As shown, a second wave plate is provided between the first light exit area 121 and the first reflective lens 1311, and a third wave plate is provided between the second light exit area 122 and the second reflective lens 1312. The second wave plate is used to rotate the polarization direction of the second color light beam emitted from the first light exit area 121 by 90°±10°, and the third wave plate is used to rotate the polarization direction of the third color light beam emitted from the second light exit area 122 by 90°±10°. In this way, the polarization directions of the light beams emitted from the first light exit area 121 and the second light exit area 122 are respectively changed by the second wave plate and the third wave plate, so that the polarization directions of the light beams emitted from the first light exit area 121 and the second light exit area 122 are consistent with the polarization direction of the light beam emitted from the third light exit area 123, thereby improving the light uniformity of the laser projection light source 1.

[0053] In the above embodiment, optionally, Figure 7 As shown, the second wave plate and the third wave plate are integrally formed to form structure 135. In this way, the laser projection light source 1 includes fewer parts, and has lower structural complexity and assembly difficulty.

[0054] In order to improve the uniformity of the light beams emitted by the plurality of light combining lens groups 131 when they are combined into one light beam, in some embodiments, for example Figure 4 As shown, a light homogenizer 133 is provided on the light incident side of the light outlet 112. The light homogenizer 133 can improve the uniformity of the outgoing light beams of the multiple light combining lens groups 131 when they are combined into one light beam.

[0055] In some embodiments, the light homogenizer 133 is a diffuser or a fisheye lens.

[0056] Example 2, as Figure 8 As shown, the optical path assembly 13 includes two light-combining lens groups 131; the two light-combining lens groups 131 are respectively used to combine the multiple colors of light emitted by the two lasers 12, and both light-combining lens groups 131 emit light beams toward the light outlet 112. This makes the optical path assembly 13 simple in structure and low in cost, and the laser projection light source is compact, less complex, and easy to implement.

[0057] In a second aspect, some embodiments of the present invention provide a laser projection device, such as Figure 9 As shown, it includes a laser projection light source 1, an optical machine 2 and a projection lens 3 connected in sequence. The laser projection light source 1 is the laser projection light source 1 described in any embodiment of the first aspect above. The optical machine 2 is used to modulate the illumination light beam emitted by the laser projection light source 1 to generate an image light beam, and project the image light beam to the projection lens 3. The projection lens 3 is used to image the image light beam.

[0058] The present invention provides a laser projection device. Since the laser projection device includes the laser projection light source 1 described in any embodiment of the first aspect above, the laser projection device provided by the present invention and the laser projection light source 1 described in the above embodiment can solve the same technical problems and achieve the same expected effects.

[0059] In some embodiments, the laser projection device further includes a projection screen, which is disposed on the light exit path of the projection lens 3 , and the projection light beam formed by the projection lens 3 forms a projection image on the projection screen.

[0060] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0061] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A laser projection light source, characterized in that: include: A housing, the housing comprising a first side wall and a second side wall opposite to each other, and a third side wall perpendicular to both the first side wall and the second side wall, the first side wall and the second side wall each having a receiving opening, and the third side wall having a light outlet; Two lasers, respectively mounted on the first side wall and the second side wall of the accommodating opening; The light-emitting surface of the laser includes a first light-emitting area, a second light-emitting area, and a third light-emitting area, which are respectively used to emit a first color light beam, a second color light beam, and a third color light beam; the polarization direction of the first color light beam emitted from the first light-emitting area of ​​at least one laser is the same as the polarization direction of the second color light beam emitted from the second light-emitting area of ​​the laser, and the polarization direction of the second color light beam emitted from the second light-emitting area is perpendicular to the polarization direction of the third color light beam emitted from the third light-emitting area; Two light combining lens groups are arranged in the housing and are used to combine the multiple colors of light emitted by the two lasers; The light combining lens group includes a plurality of reflectors, which are respectively arranged corresponding to the plurality of light exit areas and are respectively used to direct the light beams emitted from the plurality of light exit areas toward the light exit port; Wherein, a first wave plate is arranged between at least one of the plurality of light exit areas and a corresponding one of the reflectors.

2. The laser projection light source according to claim 1, characterized in that: The first color light beam emitted by the first light emitting area is one of a blue light beam and a green light beam, the second color light beam emitted by the second light emitting area is the other of the blue light beam and the green light beam, and the third color light beam emitted by the third light emitting area is a red light beam; The light combining lens group includes a first reflecting lens, a second reflecting lens and a third reflecting lens, which are respectively located on the light emitting sides of the first light emitting area, the second light emitting area and the third light emitting area.

3. The laser projection light source according to claim 2, characterized in that: The third reflective lens is a dichroic lens and is located on the light-emitting side of the first reflective lens and the second reflective lens.

4. The laser projection light source according to claim 2, characterized in that: The first wave plate is provided between the third light exit area and the third reflective lens, and the first wave plate is used to change the polarization direction of the light beam emitted from the third light exit area, so that the polarization direction of the light beam emitted from the third light exit area is consistent with the polarization direction of the light beam emitted from the first light exit area or the second light exit area.

5. The laser projection light source according to claim 1 or 2, characterized in that: Each light emitting area of ​​at least one laser corresponds to at least one lamp bead, or corresponds to at least one row of lamp beads.

6. The laser projection light source according to claim 2, characterized in that: The included angles between the reflective surface of the first reflective lens, the reflective surface of the second reflective lens, the reflective surface of the third reflective lens and the light emitting surface of the laser corresponding to the light combining lens group are all 45°±2°.

7. The laser projection light source according to claim 2, characterized in that: The distance between the first reflective lens and the first light exit area on the central axis of the first light exit area is a first distance h1, the distance between the second reflective lens and the second light exit area on the central axis of the second light exit area is a second distance h2, and the distance between the third reflective lens and the third light exit area on the central axis of the third light exit area is a third distance h3. The first distance h1, the second distance h2 and the third distance h3 are all 1~6 mm.

8. The laser projection light source according to claim 1, characterized in that: The arrangement direction of the first light emitting area, the second light emitting area, and the third light emitting area is parallel to the light emitting surface of the laser.

9. The laser projection light source according to claim 1, characterized in that: A light uniforming member is further provided at the light outlet, and the light uniforming member is a diffuser or a fisheye lens.

10. The laser projection light source according to claim 1, wherein: The transmission path of the third color light beam emitted from the third light exit area between the light exit surface of the laser and the light exit port is shorter than the transmission path of the first color light beam emitted from the first light exit area between the light exit surface of the laser and the light exit port, or shorter than the transmission path of the second color light beam emitted from the second light exit area between the light exit surface of the laser and the light exit port.

11. The laser projection light source according to claim 2, characterized in that: The polarization direction of the first color light beam emitted from the first light exiting area is the same as the polarization direction of the second color light beam emitted from the second light exiting area, and the polarization direction of the second color light beam emitted from the second light exiting area is perpendicular to the polarization direction of the third color light beam emitted from the third light exiting area; A second wave plate is arranged between the first light exit area and the first reflective lens, and a third wave plate is arranged between the second light exit area and the second reflective lens. The second wave plate is used to rotate the polarization direction of the first color light beam emitted from the first light exit area by 90°±10°, and the third wave plate is used to rotate the polarization direction of the second color light beam emitted from the second light exit area by 90°±10°.

12. A laser projection device, characterized in that: It includes a laser projection light source, an optical machine and a projection lens connected in sequence, the laser projection light source is the laser projection light source according to any one of claims 1 to 11, the optical machine is configured to modulate the illumination light beam emitted by the laser projection light source to generate an image light beam, and project the image light beam to the projection lens, and the projection lens is configured to image the image light beam.

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